ArrayType

added in 0.2.0 • last revisions

Syntax

type ArrayType<T>

Utility type that extracts the element type from an array type.

Example 1

import { ArrayType } from 'potence';

type Foo = ArrayType<Array<string>>                     // Foo is of type string
type Bar = ArrayType<Array<number | string | symbol>>   // Bar is of type number | string | symbol

Example 2

import { ArrayType } from 'potence';

function foo<T extends unknown[]>(array: T): ArrayType<T> {
    return array[0];
}

Remarks

This type is primarily useful with other generics, such as in the second example above. Even in those cases, though, it is generally preferable to use a type T[] instead and then simply return T, unless you really need an array type, not an array element type.